15
07
THERM CONNECT
defrost
WOLF run around coil systems
07.02 Frequency inverter display
The most important system parameters can be read directly from the display of the frequency inverter:
Setpoint input
Control signal valve
Frequency pump
Temperature of exhaust
air flow
Return air temperature
07.03 Control functions
• External enable On
• The system starts up to the minimum frequency. The valve closes as long as no external power signal (
0-10V DC) is present.
• External power signal ( 0-10V DC) from the higher-level temperature control sequence
• The setpoint of the circulating water-glycol quantity is determined depending on the ext. power signal, the
maximum water quantity and the frost protection temperature value.
• The volume flow is controlled in the internal control sequence valve and speed control of the recirculation
water pump via frequency converter.
• External release Off
• The system stops
Periodic pump run:
To prevent the pump from getting stuck, even if there is no demand from the control system, a periodic pump run is
performed once a week. During this, the pump runs for 10 minutes at 50% power demand.
Frost protection control:
The integrated frost protection control is set to the limit value -1°C at the factory. Experience has shown that this
value is sufficient to prevent icing of the register and at the same time to operate the heat recovery as efficiently as
possible.
If this frost protection is not sufficient, a second limit value at -2.5°C is stored. If the temperature falls below this
limit, the system is switched off and locked.
